One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(9,10,13,15)(11,16,14,12)(17,18,20,23)(19,22,27,31)(21,29,28,24)(25,30,26,32)(1,3,4,8)(2,5,6,7)(9,11,13,14)(10,12,15,16)(17,19,20,27)(18,22,23,31)(21,25,28,26)(24,32,29,30)(9,12,14,10,13,16,11,15)(18,23)(19,25,27,26)(22,30,31,32)(24,29)(2,6)(5,7)(10,15)(12,16) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.